DNA mismatch repair defects and microsatellite instability status in periocular sebaceous carcinoma

Anand Rajan Kd, Christopher Burris, Nicholas Iliff, Michael Grant, James R. Eshleman, Charles G. Eberhart

Research output: Contribution to journalArticlepeer-review


Purpose To characterize mismatch repair protein expression and the role of DNA repair abnormalities in sebaceous carcinomas of the ocular adnexa. Design Retrospective case-series study. Methods We reviewed 10 cases of sporadic sebaceous carcinoma and 1 case involving a patient with a family history consistent with Muir-Torre syndrome. Immunohistochemistry was used to analyze the presence of 4 mismatch repair proteins (MLH1, MSH2, MSH6, and PMS2) in these tumors. DNA was extracted from 7 of the larger tumors as well as from adjacent normal control tissue and microsatellite instability (MSI) analysis using 5 highly sensitive mononucleotides and 2 pentanucleotides was performed. Results All 10 sporadic periocular sebaceous carcinomas maintained strong staining of the 4 mismatch repair genes, while tumor from the patient with Muir-Torre syndrome showed loss of staining for the mismatch repair genes MSH2 and MSH6. MSI testing of 7 tumors identified no changes in sporadic cases and yielded results supporting presence of repeat sequence instability in the Muir-Torre-associated case. Conclusions Sporadic sebaceous carcinoma of the ocular adnexa is not commonly associated with a loss of mismatch repair genes or microsatellite instability.

Original languageEnglish (US)
Pages (from-to)640-647.e2
JournalAmerican journal of ophthalmology
Issue number3
StatePublished - Mar 2014

ASJC Scopus subject areas

  • Ophthalmology

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